Baby jimmy's parent places a brand new rattle in his crib, and jimmy immediately picks it up and tries to mouth the rattle and when it shakes it makes noise. jimmy immediately tries shaking the rattle different ways to see how the sound changes. he seems to enjoy this activity. piaget would say that this is an example of:
a) substage 2: first habits and primary circular reactions
b) substage 1: simple reflexes
c) substage 3: secondary circular reactions
d) substage 4: coordination of secondary circular reactions